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Dr. Andy
Dr. Andy, Medical Director
Category: Dog
Satisfied Customers: 30279
Experience:  UC Davis graduate, Interests: Dermatology, Internal Medicine, Pain Management
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My dog has lost his energy. He used to run & play now he just

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My dog has lost his energy. He used to run & play now he just plods round and sleeps a lot. Why?
Welcome! My name isXXXXX am a UC Davis graduate, and currently, a Medical Director of a veterinary hospital.

I am sorry to hear about this concern for Angus.
Very difficult question.
Unfortunately, lethargy and/or weakness simply has too many differentials. We don't know if this could be secondary to some type of infection, possible pain, a endocrine condition like Addison's or hypothyroidism, to name a few.

So, if it is very obvious his change in behavior, than you know for sure there is clearly a systemic (internal) issue that needs to be addressed.
So, what to do?

I would schedule a examination, even tomorrow if really appearing weak, and request some basic testing.

A canine basic blood test and a urine test (urinalysis) may answer a lot of concerns, or at least rule-out many possible explanations.

What can tests tell you:
Chemistry Panel
CBC (complete blood count)

Otherwise, without the tests, there is just no way for the vet to guide any guess at therapy.

I hope that information has been helpful.
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